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Dysponetus joeli sp. n. (Polychaeta: Chrysopetalidae) from the northeast Atlantic, with a cladistic analysis of the genus and a key to species

TitreDysponetus joeli sp. n. (Polychaeta: Chrysopetalidae) from the northeast Atlantic, with a cladistic analysis of the genus and a key to species
Type de publicationJournal Article
Year of Publication2012
AuteursOlivier, F, Lana, Pda Cunha, de Oliveira, VM, Worlsfold, T
JournalJournal of the Marine Biological Association
Volume92
Pagination989–996
Résumé

We describe Dysponetus joeli sp. nov. from shallow maerl habitats in the north-east Atlantic (English Channel and Bay of Biscay). Dysponetus joeli differs from congeneric species by a unique combination of characters, including a large syllid-like pharynx, 2–4 simple serrated neurochaetae (closely similar to notochaetae, but much smaller and more delicate), D-shaped chaetal spines and ventral cirri on the third segment. A phylogenetic parsimony analysis based on morphological traits suggests that Dysponetus is not monophyletic unless it includes the closely related genera Vigtorniella and Pseudodysponetus, which are well delineated inside the dysponetid clade. Chaetal spines seem to be secondarily derived from paleae and to have originated in infaunal dysponetid forms. They should not be considered as plesiomorphic, but as evidence to support the clade made up by Dysponetus–Vigtorniella and Pseudodysponetus as delineated by a phylogenetic analysis.

DOI10.1017/S0025315412000562